Buckling Analysis in SAP
Buckling Analysis in SAP
(OP)
Dear All,
Kindly, I asked about the Scale factor obtained from SAP buckling analysis for Simple supported Column (attached) , I found it totally different from value determined from Sec. E3 AISC 2010.
Can anyone explain why?
Thanks alot
Kindly, I asked about the Scale factor obtained from SAP buckling analysis for Simple supported Column (attached) , I found it totally different from value determined from Sec. E3 AISC 2010.
Can anyone explain why?
Thanks alot





RE: Buckling Analysis in SAP
RE: Buckling Analysis in SAP
Also I can´t open your file. This is because you are using a more recent version of Sap 2000 ( I think V14.02). Better send the text file .$2k or s2k,in order to open the file.
jatfuentes
RE: Buckling Analysis in SAP
The most likely cause of difference with classical formulas (for buckling analysis here is for an elastic critical load value, through a factor on the applied loading) is the inclusion of the self weight of the member, that is not usually accounted in the classical derivations.
I post a pdf explaining what made.
RE: Buckling Analysis in SAP
Just like ishvaag, I have tried many models vs books and I get satisfactory results. But only after good meshing.
respects
ijr
RE: Buckling Analysis in SAP
I thanks all for your time and efforts.
I found my mistake, i compared with Pcr not with Pey(correct).
Excuse me, there is another example when i tried to compare the SAP out put value to Pey in the moment frame with fixed base(attached-s2k file), i found difference in the results as the following:
for W12x72 cols(L=3m)and beam(L=6m)section
a=136.13 cm2, r3=13.51 cm, r2= 7.72 cm
1-for manual calculation:
GA=1, GB= Lb/Lc = 6/3 = 2 because the E and I are the same
K from alignment chart-sides way uninhibited= 1.45
Fey=π²*E/(KL/r2)²=π²*2038.9/(1.45*300/7.72)²=6.34 t/cm2
choosen r2 because the first mode from sap buckling about axe2-2
2-for SAP file
Pey from the first mode (buckling about axe 2-2) = 308
Fey= 308/136.13=2.26 t/cm2
please,Can anyone explain why and if any one has a source for solved example in the buckling analysis in sap?
your co-operation will be high appreciate
thanks alot